【摘要】 用HPGe探测器γ谱仪测定了厦门海域两个沉积物岩心的放射性核素,研究了40K、137Cs、210Pb、226Ra、228Ra、228Th和238U7种放射性核素的垂直分布特征.综合文献数据与我们的研究结果给出沉积物中7种核素的比活度分别为510~1 096、2.64~4.01、48.4~129、9.6~40.0、49.9~94.3、56.3~89.2、11.5~82.3Bq/kg.用210Pbex方法计算得到的厦门西南和东北海域的沉积速率为2.62、2.43cm/a.文献给出的环厦门海域沉积速率范围值为0.07~13.2cm/a,算术平均值为3.2cm/a,主要集中在0.07~2.5、3.5~6.0cm/a范围内.更多还原

【Abstract】 Radionuclides in two sediment cores from the sea surrounding Xiamen Island were measured by HPGe γ spectrometer.The vertical distribution of 40K,137Cs,210Pb,226Ra,228Ra,228Th and 238U were studied.It shows that the contents of 7 nuclides are 510~1 096,2.64~4.01,48.4~129,9.6~40.0,49.9~94.3,56.3~89.2 and 11.5~82.3Bq/kg,respectively,estimated by this experiment and from the literatures.The sedimentary rates evaluated by 210Pbex are 2.62 and 2.43cm/a,respectively,in seas of the southwest and northeast of Xiamen Island.The sedimentary rates derived from literatures are 0.07~13.2cm/a with arithmetic mean of 3.2cm/a,mostly in the ranges of 0.07~2.5 and 3.5~6.0cm/a.更多还原